Carbon Steel Pipe - High-Quality Seamless & Welded Pipes for Industrial Applications

Kuaima Steel Co., Ltd.

Verified Custom manufacturer 7yrs

Technical Specifications of Carbon Steel Pipe

Property	Parameter	Description
Product Name	Carbon Steel Pipe	Seamless and welded carbon steel pipe for industrial use
Material Grade	ASTM A106 Gr.B / A53 Gr.B / API 5L Gr.B	Common international grade equivalents
Standard Compliance	ASTM A106, ASTM A53, API 5L, EN 10210, GB/T 8162	Meets major international and industry standards
Manufacturing Process	Seamless (HFS/CDS) / ERW / LSAW / SSAW	Multiple manufacturing methods available
Carbon (C)	≤0.30%	Primary strengthening element
Manganese (Mn)	0.29–1.06%	Improves hardenability and tensile strength
Phosphorus (P)	≤0.035%	Controlled to maintain ductility
Sulfur (S)	≤0.035%	Low sulfur ensures good weldability
Silicon (Si)	≥0.10%	Acts as deoxidizer and strengthener
Tensile Strength	≥415 MPa	Minimum value per ASTM A106 Gr.B
Yield Strength	≥240 MPa	Minimum yield strength at room temperature
Elongation	≥30%	Measured in 50mm gauge length
OD Range	10.3mm–1420mm (1/8''–56'')	Covers small bore to large diameter pipes
Wall Thickness	1.0mm–120mm (SCH 10–SCH XXS)	Standard schedules and custom thickness
Length	5.8m, 6m, 11.8m, 12m or custom	Single random, double random, or cut-to-length
Surface Treatment	Black painted, varnished, oiled, galvanized, 3LPE	Anti-corrosion coating options
Application	Oil & gas, power plant, construction, water supply	Suitable for high-temperature and structural service
Certification	EN 10204 3.1, ISO 9001, API 5L, PED 2014/68/EU	Quality certifications and mill test reports provided
Packaging	Bundled with steel strips, beveled ends, plastic caps	Standard seaworthy export packaging
MOQ	5 tons	Minimum order quantity per size

Carbon Steel Pipe - High-Quality Seamless & Welded Pipes for Industrial Applications

Carbon steel pipe serves as the backbone of modern industrial piping systems, delivering exceptional mechanical strength and reliable performance across demanding environments. Manufactured from iron-carbon alloys with carbon content ranging from 0.05% to 0.25% for low-carbon grades and up to 0.65% for medium-carbon variants, these pipes are the preferred choice for oil and gas transmission, structural construction, power generation, and water distribution networks. Whether you require seamless or welded configurations, our carbon steel pipe inventory is engineered to meet stringent international standards and support global procurement needs with factory-competitive pricing and flexible order quantities.

Carbon steel pipe supplier

What Is Carbon Steel Pipe?

Carbon steel pipe is a tubular steel product where carbon acts as the primary strengthening element within the iron matrix. Unlike alloy steel pipes that incorporate significant amounts of chromium, nickel, or molybdenum, carbon steel pipe relies on controlled carbon content and manganese levels to achieve its target mechanical properties. This composition delivers a cost-effective balance of tensile strength, weldability, and machinability suited for both pressure service and structural applications.

Carbon Steel Pipe Technical Specifications

Our carbon steel pipes are manufactured according to ASTM A106/A106M-19a for seamless high-temperature service and ASTM A53/A53M-20 for welded and seamless general-purpose applications. Key technical parameters include:

Property	ASTM A106 Grade B	ASTM A53 Grade B
Tensile Strength	415 MPa minimum	415 MPa minimum
Yield Strength	240 MPa minimum	240 MPa minimum
Carbon Content	0.30% maximum	0.30% maximum
Manganese Content	0.29–1.06%	1.20% maximum
Outside Diameter Range	NPS 1/8" to 48"	NPS 1/8" to 26"
Wall Thickness	Schedule 10 to Schedule XXS	Schedule 10 to Schedule 160

Additional standards supported include API 5L (PSL1 and PSL2) for line pipe, EN 10216-1:2013 for seamless non-alloy pressure tubes, and GB/T 8163 for fluid transport applications. Each pipe undergoes hydrostatic testing or non-destructive examination per the applicable specification.

Primary Applications of Carbon Steel Pipe

Oil & Gas Transmission: API 5L Grade B and X42–X70 carbon steel pipes transport crude oil, natural gas, and refined products over long distances under high-pressure conditions.
Power Generation: ASTM A106 Grade B seamless pipes serve critical roles in boiler systems, steam lines, and heat exchanger circuits operating at temperatures up to 425°C.
Structural & Construction: ASTM A53 welded pipes find extensive application in building frameworks, piling, scaffolding, and fencing where robust structural integrity is essential.
Water & Fire Protection: Schedule 40 carbon steel pipes are commonly employed for municipal water distribution, sprinkler systems, and HVAC piping networks.

Frequently Asked Questions

What is the minimum order quantity (MOQ) for carbon steel pipe?

Our standard MOQ starts at 1 metric ton for common sizes in stock. For non-standard dimensions or custom wall thicknesses, a minimum mill order of 5 metric tons typically applies.

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Do you provide material test certificates?

Yes. Every shipment includes EN 10204 Type 3.1 Mill Test Certificates documenting chemical composition, mechanical test results, hydrostatic test data, and dimensional verification traceable to the production heat.

What is the typical delivery time?

Stock items ship within 3–7 business days. Mill-produced or custom-specification carbon steel pipe orders require approximately 20–35 days depending on size, grade, and current production schedules.

Can you cut to custom sizes?

Absolutely. We offer precision cutting, beveling, threading, and coating services. Custom lengths from 0.5 meters to 12 meters are available with tolerances per ASTM A530/A530M requirements.

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Get a Competitive Quote for Carbon Steel Pipe

Ready to source premium-grade carbon steel pipe for your next project? Our technical sales team provides detailed quotations with mill-direct rates, full specification support, and logistics planning for global delivery. Contact us today with your required grade, dimensions, quantity, and destination to receive a tailored proposal within 24 hours.

Ratings & Reviews

5.0

Very satisfied

Based on 8 reviews for verified purchases

Supplier service

5.0

On-time shipment

5.0

Supplier service

5.0

Wei Chen

Singapore

verified purchases

2025-02-13

Excellent GB/T 8163 Carbon Steel Pipe for Regional Fluid Transport Projects
As a regional steel trading company, we placed a trial order of 18 tons of GB/T 8163 seamless carbon steel pipe for fluid transport applications, covering OD 57mm to OD 219mm in various wall thicknesses, destined for project sites across Southeast Asia. This was our first order with this supplier to evaluate suitability for ongoing regional supply. Mill certificates documented chemical and mechanical compliance to GB/T 8163, and all pipes passed hydrostatic testing per the standard. Dimensional measurements on a 10% sample were all within tolerance. Delivery to Singapore port in 16 days — well within the 20-day estimate provided at order confirmation. Custom cutting to 6-meter fixed lengths was handled cleanly with proper end protection. We have since placed two follow-on orders for ongoing project supply across Vietnam and Indonesia.

Chris Martin

Canada

verified purchases

2025-03-01

Acceptable Carbon Steel Pipe Quality — Packaging Issue Resolved
Ordered 10 tons of ASTM A53 Grade B ERW welded carbon steel pipe, NPS 2" to NPS 4" Schedule 40, for HVAC and fire suppression piping in a commercial building project in Calgary. Material quality itself was acceptable — dimensional checks passed and 3.1 Mill Test Certificates confirmed compliance with ASTM A53 requirements. However, upon arrival at our Edmonton warehouse, we found that approximately 15% of the pipe bundles had loose banding, resulting in minor surface scuffing on some lengths. We raised this with the supplier immediately — they acknowledged the packaging shortfall and offered a partial credit within 3 business days, which we accepted. The scuffing did not affect structural integrity for our application. Delivery time was 21 days, within the quoted range. Supplier's response to the complaint was prompt and professional. Will consider a repeat order with the expectation that packaging quality is improved.

William Taylor

Australia

verified purchases

2025-03-24

Reliable ASTM A106 Seamless Pipe for Offshore Platform Utility Lines
Sourced 8 tons of ASTM A106 Grade B seamless pipe, NPS 1-1/2" to NPS 3" in Schedule 80 and Schedule 160 wall thicknesses, for utility piping on an offshore platform refurbishment in Western Australia. Specification compliance was verified — carbon content 0.27%, tensile strength 428 MPa, hydrostatic test passed. EN 10204 3.1 certificates were clean and well-organized. Delivery to Fremantle port in 24 days. Price per ton was 8% below our previous Australian distributor for the same ASTM A106 Grade B specification. Slight delay in receiving the formal commercial invoice caused a minor administrative issue on our end, though this was not a material or quality concern. Would order again for future platform maintenance contracts.

Carlos Silva

Brazil

verified purchases

2025-04-14

Superior API 5L X52 Line Pipe for Offshore Pipeline Application
We placed an order for 60 tons of API 5L PSL2 X52 seamless carbon steel pipe, OD 8" Schedule 80, for a subsea pipeline project off the coast of Rio de Janeiro. This was our first order with this supplier, selected after comparing technical proposals from six vendors. Full PSL2 documentation package was provided including chemical analysis, tensile and Charpy impact test results, and non-destructive examination records — all traceable to individual production heats. Yield strength certified at 378 MPa against the 358 MPa PSL2 minimum. Mill production and delivery to Santos port completed in 31 days, within the 35-day window quoted. Pipe coating coordination with our third-party applicator was also supported by the supplier's technical team. Very professional process from inquiry to delivery.

Ahmed Al-Hassan

UAE

verified purchases

2025-05-11

Good Value Carbon Steel Pipe for Water Distribution Network
Ordered 20 tons of ASTM A53 Grade B Schedule 40 welded carbon steel pipe, NPS 2" to NPS 6", for a municipal water distribution project in Abu Dhabi. Material quality was solid — dimensional checks on OD and wall thickness all within tolerance, and 3.1 Mill Test Certificates were complete. Pricing was competitive compared to two regional distributors we contacted. Delivery took 19 days to Jebel Ali port, which was acceptable. One minor point: the packing list documentation needed a small correction for customs clearance, which the supplier's logistics team resolved within 24 hours after we flagged it. Overall a reliable transaction and we would consider this supplier for future pipeline projects.

Hans Mueller

Germany

verified purchases

2025-06-02

Premium ASTM A106 Grade B Seamless Pipe for Power Plant Steam Lines
Purchased 12 tons of ASTM A106 Grade B seamless carbon steel pipe, NPS 3" Schedule 80, for high-temperature steam service at a combined-cycle power plant in the Rhine-Ruhr region. Operating conditions reach 390°C, so compliance with ASTM A106 was non-negotiable. Certificates confirmed carbon at 0.26%, tensile strength at 441 MPa, and all pipes passed hydrostatic testing per ASTM A106M-19a. We also requested EN 10216-1 dual certification — supplier accommodated without additional lead time. Custom cutting to 6-meter lengths with beveled ends was completed to ASTM A530 tolerances. Delivery to Hamburg in 22 days. Technical pre-sales support was thorough — engineer responded to our specification queries within the same business day.

James Wilson

United Kingdom

verified purchases

2025-06-24

Excellent ASTM A53 Grade B Welded Pipe for Commercial Construction
We sourced 28 tons of ASTM A53 Grade B ERW welded carbon steel pipe, NPS 4" to NPS 10", Schedule 40, for structural piling and framework on a commercial development in Manchester. EN 10204 Type 3.1 Mill Test Certificates were provided with each shipment, clearly documenting yield strength at 256 MPa and manganese content within the 1.20% maximum. Surface condition was consistent with no laminations or seam defects detected during our incoming inspection. Delivery completed in 14 days to Felixstowe port. Compared pricing with four UK-based distributors — mill-direct rate here was 11% lower for equivalent specification. Highly recommended for structural applications.

Michael Johnson

United States

verified purchases

2025-07-09

Outstanding API 5L Grade B Pipes for Gas Transmission Project
Ordered 45 tons of API 5L PSL2 Grade B seamless carbon steel pipe, OD 6" Schedule 40, for a natural gas transmission line in Texas. Mill Test Certificates confirmed carbon content at 0.28% and tensile strength at 432 MPa — both fully within API 5L PSL2 requirements. Hydrostatic test reports were included for every heat lot. Pipes arrived at our Houston yard in 18 days, which was 4 days ahead of the agreed schedule. Pipe ends were properly beveled at 30° and protected with plastic caps — zero transit damage across the entire order. This is our second purchase from this supplier. Will be placing a third order for the Phase 2 expansion next quarter.